Server has disappeared... kind of.... maybe....

Got a notice today from a monitoring service that one of my servers was unreachable. I ran a traceroute and ping, and the domain was resolving to the proper IP, but I couldn't get to it via the browser. I tried another ISP and got the same result. I could get to another domain on this server.

As I worked on it, things began to change. First, I couldn't get to the second domain that I was trying. then, when rerunning the traceroute, I got "Lookup Failed. No IP address or host name with a valid lookup in input." as a response. Ping still comes back ok.

This has all happened in the span of 10 minutes. Shell doesn't work.

I'm not sure how to go about troubleshooting this. Usually, it's a work/don't work type of deal. I've never had it systematically shut down sites on the way towards the light

Got a notice today from a monitoring service that one of my servers was unreachable. I ran a traceroute and ping, and the domain was resolving to the proper IP, but I couldn't get to it via the browser. I tried another ISP and got the same result. I could get to another domain on this server.

As I worked on it, things began to change. First, I couldn't get to the second domain that I was trying. then, when rerunning the traceroute, I got "Lookup Failed. No IP address or host name with a valid lookup in input." as a response. Ping still comes back ok.

This has all happened in the span of 10 minutes. Shell doesn't work.

I'm not sure how to go about troubleshooting this. Usually, it's a work/don't work type of deal. I've never had it systematically shut down sites on the way towards the light

thanks,
json

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sounds like a named issue where some sites have stale DNS zones good enough and others don't query for you. can you get to everything via IP address directly?